I would like to use $view.scale to format my labels depending on the map scale. The documentation mention that it's only supported in rendering context, is there any plan to implement it in the labeling context ?
It is correct that the viewscale is not available in the expression for labels at this moment. I can see that this would be a interesting feature, although probably more useful if this option is provided without the need for Arcade in the user interface. You could create an idea: ArcGIS Ideas
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